Specifications for Liquid Plant Food 3-18-18
| COMPONENT | SPECIFICATION |
| Appearance | clear |
| ph | 7.0 – 7.35 |
| Nitrogen % | 3.0 – 3.2 |
| P205 % | 18.0 – 18.2 |
| K20 % | 18.0 – 18.2 |
| Salt Index | 38 |
| Freezing Point | 0° – 4°F |
| Salt Out Temperature | N/A |
Yield-Plus uses tight quality control standards. Components include urea (low biuret), phoshoric acid (food grade or technical grade), potassium hydroxide (meets food chemicals codex).
Specifications for Liquid Plant Food 10-20-10
| COMPONENT | SPECIFICATION |
| Appearance | clear |
| ph | 7.0 – 7.30 |
| Nitrogen % | 10.0 – 10.2 |
| P205 % | 20.0 – 20.2 |
| K20 % | 10.0 – 10.2 |
| Salt Index | 39-40 |
| Freezing Point | 0° – 4°F |
| Salt Out Temperature | N/A |
Soil pH Affects Availability of Plant Nutrients
Salt Index
Definition: An index used to compare solubilities of chemical compounds. Most nitrogen and potash compounds have a high index, and phosphate compounds have a low index. When applied too close to the seed or on foliage, the ones with high indexes cause plants to wilt or die. (The Fertilizer Institute)
Caution: Watch out for false propaganda from competitors that are calculating salt index using a non-industry standard method. A dead giveaway to this fact is that they claim 10-34-0 has a salt-index in the 30s when it is actually in the 70s.